I delete them periodically. If something is important enough to keep, it should be in an email. My text messages tend to have no lasting value... "Did you feed the fish?" "When will you be home?" "Where's my allowance?" and so on.

Why you text messages when you have BBM? With that said I clear mine often, no reason, just don't need them for any reason.

Because most people (yes, I realize people here don't want to believe this) don't have BBM. Your friends/family might, but you have to realize most people in the world don't. I have 2 people I regularly/semi regularly BBM. They would prefer it if I didn't use BBM since they installed BBM on their phones just because I asked them to and they don't use it with anyone else. And I had more but they stopped using it after realizing how buggy it was and how it was missing features that Whatsapp had. If I tell people to install BBM, I'll get a "why don't YOU just use Whatsapp, LINE, WeChat, Viber, etc? Why should I change when things are much easier if you just use our program? If you don't want to use MY program, just text me. Why would I ever install a new app just to talk to one person when I can just text that person?"

It's pretty hypocritical to badger people into installing your chat program and refusing to install the one they want you to install.

As for the original question, seeing that I'm still on 10.1 I clear it whenever my phone bogs down.

Because most people (yes, I realize people here don't want to believe this) don't have BBM. Your friends/family might, but you have to realize most people in the world don't. I have 2 people I regularly/semi regularly BBM. They would prefer it if I didn't use BBM since they installed BBM on their phones just because I asked them to and they don't use it with anyone else. And I had more but they stopped using it after realizing how buggy it was and how it was missing features that Whatsapp had. If I tell people to install BBM, I'll get a "why don't YOU just use Whatsapp, LINE, WeChat, Viber, etc? Why should I change when things are much easier if you just use our program? If you don't want to use MY program, just text me. Why would I ever install a new app just to talk to one person when I can just text that person?"

It's pretty hypocritical to badger people into installing your chat program and refusing to install the one they want you to install.

Exactly. Even the few friends of mine that do own a BlackBerry device use SMS (except for when one of us is out of the country).

You have to, any phone in any os with any amount of ram or processing power needs to have long threads of convos deleted. Very frustrating on 10.1 how some convos wouldn't even load if they were too long. Definitely fixed with 10.2, but always gotta delete every once in a while